Drying oven air return pipe

Abstract

The utility model relates to the field of oven parts, in particular to an air return pipe of an oven. The drying oven air return pipe comprises a pipe body with one end open and the other end closed; the multiple air plates are all located in the pipe body, and the air plates are rotationally connected with the pipe body; and a group of ventilation holes are formed in the side wall of the pipe body between every two adjacent air plates. The opening degree of the air plate far away from the open end of the pipe body is reduced, so that the flow speed of airflow in the ventilation holes in the position is increased, the flow speed of the airflow in the ventilation holes in all the positions of the pipe body is consistent, the backflow uniformity of the airflow in the drying oven is improved, and the drying effect of the drying oven is improved.

Description

Technical Field

[0001] The present application relates to the field of oven parts, and in particular to an oven return air duct. Background Art

[0002] At present, film drying ovens usually adopt the working mode of hot air flow drying, that is, a hot air flow of a certain temperature is introduced into the oven. In order to achieve the introduction of hot air flow, the oven is provided with a spray pipe and a return air pipe. The spray pipe introduces hot air flow into the oven, while the return air pipe is used to recover the hot air flow in the oven, so that air circulation is formed inside the oven to improve the drying effect.

[0003] In order to improve the circulation effect of the hot air flow, the return air duct is usually in the shape of a long tube, one end of which is open and connected to the fan, and the other end is closed. Ventilation holes are opened on the tube wall. There are several ventilation holes and they are distributed along the length of the return air duct, so that the ventilation holes are evenly distributed in various positions in the oven. The hot air flow in the oven enters the return air duct through the ventilation holes, thereby ensuring that the air flow at various positions in the oven can enter the return air duct to realize air circulation, so as to ensure the uniformity of the air flow in the oven and further ensure the drying effect.

[0004] However, since the return air duct is usually long, the airflow velocity in the vents near the fan end is high, while the airflow velocity in the vents far from the fan end is low, which easily leads to poor uniformity of airflow return in the oven, which is not conducive to improving the drying effect. Therefore, how to ensure the consistency of airflow velocity in the vents at various positions of the return air duct, so as to help improve the drying effect, is a technical problem that needs to be solved in this field. Utility Model Content

[0005] In order to improve the uniformity of airflow in an oven, the present application provides an oven return air duct.

[0006] The oven return air duct provided in this application adopts the following technical solution:

[0007] An oven return air duct, comprising:

[0008] a tube body, one end of which is open and the other end is closed;

[0009] A plurality of wind plates are provided and are all located inside the tube body, and the wind plates are rotatably connected to the tube body;

[0010] A group of ventilation holes is provided on the side wall of the tube body between two adjacent wind plates.

[0011] By adopting the above technical solution, the angle of the wind plate is adjusted to change the area of ​​the tube body. Specifically, since the negative pressure at the tube body away from the return air device is smaller, the opening of the wind plate farther away from the opening end of the tube body is smaller, so that the ventilation area of ​​the tube body is smaller, and the air flow velocity here will increase. Similarly, the closer the wind plate is to the opening end of the tube body, the larger the opening is. Since the negative pressure near the return air device is larger, the wind speed of the ventilation holes here is higher, so that the air flow velocity in each ventilation hole is close to or consistent, thereby improving the uniformity of air flow backflow in the oven.

[0012] Preferably, each group of ventilation holes includes a plurality of circular holes surrounding the circumference of the tube body, and the plurality of circular holes are distributed in multiple rows along the length direction of the tube body.

[0013] By adopting the above technical solution, multiple rows of circular holes can effectively increase the flow rate of airflow, thereby increasing the circulation speed of airflow.

[0014] Preferably, it also includes an adjusting component; the adjusting component includes an adjusting shaft, the adjusting shaft is fixedly connected to the rotating shaft of the wind plate, and the adjusting shaft passes through the tube body and extends to the outside of the tube body.

[0015] By adopting the above technical solution, the opening of the air plate can be adjusted by rotating the adjustment shaft, which is easy to operate.

[0016] Preferably, the adjustment component also includes a limit sleeve, which is located outside the tube body and is sleeved on the adjustment shaft, the end of the limit sleeve is fixedly connected to the tube body, the adjustment shaft is provided with a limit tooth, and the limit sleeve is provided with a limit groove corresponding to the limit tooth.

[0017] By adopting the above technical solution, through the cooperation between the limiting slot and the limiting tooth, the limiting sleeve can lock the adjustment shaft, thereby locking the wind plate, further ensuring the stable operation of the wind plate.

[0018] Preferably, the adjusting shaft comprises a fixed shaft and a telescopic sleeve, the fixed shaft is fixedly connected to the wind plate, the telescopic sleeve is outside the fixed shaft and passes through a limit sleeve, a rotation limit piece is arranged between the telescopic sleeve and the fixed shaft, and the limit tooth is arranged on the telescopic sleeve.

[0019] By adopting the above technical solution, the matching relationship between the limiting teeth and the limiting slots can be adjusted through the telescopic sleeve, thereby achieving unlocking and locking of the wind plate.

[0020] Preferably, the rotation limiting member is configured as a ball, a placement groove for placing the ball is provided on the inner wall of the telescopic sleeve, and a slideway for the ball to move is provided on the side wall of the fixed shaft.

[0021] By adopting the above technical solution, the friction of the adjusting shaft during the rotation process can be reduced, which can not only limit the relative rotation of the fixed shaft and the telescopic sleeve, but also improve the smoothness of the movement of the telescopic sleeve, making it easier to operate.

[0022] Preferably, the tube body is configured as a round tube, and the wind plate is configured as a circular plate.

[0023] By adopting the above technical solution, when the wind plate rotates, the edge of the sealing edge will automatically break away from the inner wall of the tube body, thereby reducing friction and facilitating the adjustment of the wind plate.

[0024] Preferably, the diameter of the wind plate is smaller than the inner diameter of the tube body, and a gap is left between the edge of the wind plate and the inner wall of the tube body.

[0025] By adopting the above technical solution, direct contact between the wind plate and the tube body can be avoided, thereby avoiding the generation of friction, so as to facilitate the adjustment of the wind plate.

[0026] In summary, the present application includes at least one of the following beneficial technical effects:

[0027] 1. Since the present application adopts an adjustable air plate design, by adjusting the angle of the air plate, the flow state of the air flow in the return air duct can be changed, thereby improving the uniformity of the air flow backflow in the oven and improving the drying effect;

[0028] 2. The present application preferably adopts a special adjustment component design, which can conveniently adjust the angle of the wind plate and lock the wind plate through the telescopic and locking functions of the adjustment shaft to ensure the stability of the wind plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a schematic diagram of the structure of the oven return air duct in the embodiment of the present application;

[0030] Figure 2 is a schematic cross-sectional view of an oven return air duct in an embodiment of the present application;

[0031] Figure 3 It is a schematic diagram of the structure of the wind plate in the embodiment of the present application;

[0032] Figure 4 yes Figure 3 A partial enlarged schematic diagram of part B;

[0033] Figure 5 yes Figure 2 A partial enlarged schematic diagram of part A.

[0034] Markings in the accompanying drawings: 1, tube body; 11, ventilation hole; 2, wind plate; 3, adjustment component; 31, adjustment shaft; 311, fixed shaft; 312, telescopic sleeve; 313, rotation limiter; 314, limit tooth; 32, limit sleeve; 321, limit slot. DETAILED DESCRIPTION

[0035] The following is combined with Figure 1-5 This application is described in further detail.

[0036] This embodiment discloses an oven return air duct, referring to Figure 1 and Figure 2 , including a tube body 1 and a wind plate 2. The tube body 1 is open at one end and closed at the other end, and is in the shape of a round tube. The open end is connected to the return air device of the oven, so that the return air device extracts the hot air flow of the oven through the return air duct.

[0037] There are multiple wind plates 2, all of which are located inside the tube body 1 and are rotatably connected to the tube body 1. The shape of the wind plates is a circular plate. A group of ventilation holes 11 is opened on the side wall of the tube body 1 between two adjacent wind plates 2. Each group of ventilation holes 11 includes a number of circular holes surrounding the circumference of the tube body 1, and the circular holes are distributed in multiple rows along the length direction of the tube body 1.

[0038] During use, the area of ​​the tube body 1 is changed by adjusting the angle of the air plate 2. Specifically, since the negative pressure at the tube body 1 away from the return air device is small, the opening of the air plate 2 farther away from the open end of the tube body 1 is smaller, so that the ventilation area of ​​the tube body 1 is smaller, and the air flow velocity here will increase. Similarly, the opening of the air plate 2 closer to the open end of the tube body 1 is larger, and since the negative pressure near the return air device is larger, the wind speed of the ventilation hole 11 here is higher, so that the air flow velocity in each ventilation hole 11 is close or consistent, improving the uniformity of air flow backflow in the oven. This design helps to improve the drying effect and allows the items in the oven to be heated more evenly.

[0039] Reference Figure 2 and Figure 3 The oven return air duct further includes an adjustment component 3. The adjustment component 3 includes an adjustment shaft 31, which is fixedly connected to the rotating shaft of the air plate 2, and the adjustment shaft 31 passes through the tube body 1 and extends to the outside of the tube body 1. By rotating the adjustment shaft 31, the angle of the air plate 2 can be conveniently adjusted.

[0040] Reference Figure 4 and Figure 5The adjustment assembly 3 further includes a limiting sleeve 32. The limiting sleeve 32 is located outside the tube body 1 and sleeved on the adjustment shaft 31, and the end of the limiting sleeve 32 is fixedly connected to the tube body 1. The adjustment shaft 31 is provided with a limiting tooth 314, and the limiting sleeve 32 is provided with a limiting groove 321 corresponding to the limiting tooth 314. This design can make the adjustment shaft 31 have better stability and precision during the rotation process.

[0041] The adjusting shaft 31 includes a fixed shaft 311 and a telescopic sleeve 312. The fixed shaft 311 is fixedly connected to the wind plate 2, and the telescopic sleeve 312 is arranged outside the fixed shaft 311 and passes through the limiting sleeve 32. A rotation limiting member 313 is arranged between the telescopic sleeve 312 and the fixed shaft 311, and a limiting latch 314 is arranged on the telescopic sleeve 312. This design can make the adjusting shaft 31 have a telescopic function, and the rotation limiting member 313 can limit the relative rotation of the adjusting shaft 31 and the telescopic sleeve 312, so as to more conveniently adjust the position and angle of the wind plate 2.

[0042] Specifically, the rotation limiter 313 in the embodiment of the present application is a ball, a placement groove for placing the ball is provided on the inner wall of the telescopic sleeve 312, and a slideway for the ball to move is provided on the side wall of the fixed shaft 311. This design can reduce the friction of the adjustment shaft 31 during the rotation process and improve the smoothness and accuracy of the adjustment.

[0043] The diameter of the wind plate 2 is smaller than the inner diameter of the tube body 1, and a gap is left between the edge of the wind plate 2 and the inner wall of the tube body 1. This design ensures that the wind plate 2 will not rub against the inner wall of the tube body 1 during rotation, thereby ensuring the flexibility and service life of the wind plate 2.

[0044] In addition, for the selection of materials, such as the materials of the tube body 1 and the air plate 2, high temperature resistant and corrosion resistant materials can be selected to ensure the stability and durability of the oven return air duct in a high temperature and high humidity environment. For the design of the ventilation hole 11, in addition to the circular hole, other shapes of holes can also be used, such as square holes, oval holes, etc., to meet different airflow requirements.

[0045] In general, the oven return air duct design of the present application is flexible and can be adjusted and optimized according to actual needs to achieve the best drying effect. By improving the uniformity of airflow return in the oven, the oven return air duct of the present application can significantly improve the drying efficiency and quality, bringing substantial technological progress to the drying industry.

[0046] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. An oven return air duct, characterized in that: include: A tube body (1) having an open end and a closed end; A plurality of wind plates (2) are provided and are all located inside the tube body (1), and the wind plates (2) are rotatably connected to the tube body (1); A group of ventilation holes (11) are provided on the side wall of the tube body (1) between two adjacent wind plates (2).

2. The oven return air duct according to claim 1, characterized in that: Each group of ventilation holes (11) comprises a plurality of circular holes surrounding the circumference of the tube body (1), and the plurality of circular holes are distributed in a plurality of rows along the length direction of the tube body (1).

3. The oven return air duct according to claim 2, characterized in that: It also comprises an adjustment component (3); the adjustment component (3) comprises an adjustment shaft (31), the adjustment shaft (31) is fixedly connected to the rotating shaft of the wind plate (2), and the adjustment shaft (31) passes through the tube body (1) and extends to the outside of the tube body (1).

4. The oven return air duct according to claim 3, characterized in that: The adjustment component (3) further comprises a limiting sleeve (32), the limiting sleeve (32) being located outside the tube body (1) and sleeved on the adjustment shaft (31), the end of the limiting sleeve (32) being fixedly connected to the tube body (1), the adjustment shaft (31) being provided with limiting teeth (314), and the limiting sleeve (32) being provided with limiting grooves (321) corresponding to the limiting teeth (314).

5. The oven return air duct according to claim 4, characterized in that: The adjusting shaft (31) comprises a fixed shaft (311) and a telescopic sleeve (312); the fixed shaft (311) is fixedly connected to the wind plate (2); the telescopic sleeve (312) is outside the fixed shaft (311) and passes through the limiting sleeve (32); a rotation limiting member (313) is provided between the telescopic sleeve (312) and the fixed shaft (311); and the limiting latch (314) is provided on the telescopic sleeve (312).

6. The oven return air duct according to claim 5, characterized in that: The rotation limiting member (313) is configured as a ball bearing, a placement groove for placing the ball bearing is provided on the inner wall of the telescopic sleeve (312), and a slideway for the ball bearing to move is provided on the side wall of the fixed shaft (311).

7. The oven return air duct according to claim 1, characterized in that: The tube body (1) is configured as a circular tube, and the wind plate (2) is configured as a circular plate.

8. The oven return air duct according to claim 7, characterized in that: The diameter of the wind plate (2) is smaller than the inner diameter of the tube body (1), and a gap is left between the edge of the wind plate (2) and the inner wall of the tube body (1).

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